EP 0462821 A3 19930127 - SWIVEL ASSEMBLY FOR A PNEUMATIC UNDERGROUND PIERCING TOOL
Title (en)
SWIVEL ASSEMBLY FOR A PNEUMATIC UNDERGROUND PIERCING TOOL
Publication
Application
Priority
US 54105490 A 19900620
Abstract (en)
[origin: EP0462821A2] A swivel assembly for supporting a valve sleeve in a cavity of a striker in a pneumatic underground piercing tool. A valve supporting means supports the valve sleeve on a valve body by cooperating spherical seat and bearing members to allow angular movement between the valve sleeve and valve body. A retaining mechanism is provided for resiliently securing the valve supporting means to the valve body. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 4/14 (2006.01)
CPC (source: EP)
E21B 4/145 (2013.01)
Citation (search report)
- [A] GB 1530857 A 19781101 - INST GOR DELA SIBIR OTDEL AN S
- [AD] US 4662457 A 19870505 - BOUPLON EDWARD J [US]
- [A] GB 1170167 A 19691112 - INST GORNOGO DELA SIBIRSKOGO O [RU]
- [A] EP 0301287 A2 19890201 - SCHMIDT PAUL
- [A] EP 0224859 A1 19870610 - PIERCE AIRROW INTERNATIONAL IN [US]
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 91305550 A 19910619